Make the first sentence usable
Lead with the reason for writing so the recipient does not have to decode a long emotional introduction. For a message about how to support someone during an evacuation, use this factual base: confirm what they have shared, their current location or immediate need, and avoid repeating unverified information.
Reduce the work of responding
Offer simple options, a narrow question, or a clear update that can be understood without another conversation. Offer one concrete resource, task, safe place, transport option, or flexible check-in. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Respect the boundary already visible
Do not photograph, publish, fundraise in their name, or arrive at a crisis site without permission. Follow local emergency, evacuation, shelter, trauma, and safeguarding guidance before relying on a personal message. A block, explicit refusal, legal restriction, or safety plan takes priority over the desire to explain more.